How many moles are in 7.00E24 atoms of Ca?

Explanation:

In chemistry, a mole is the base unit of the amount of substance in a system containing elementary entities (atoms, molecules, ions, electrons), and one mole of substance corresponds to the Avogadro's constant or  entities. The stoichiometry equation that relates the amount of substance into the measurement in moles is

                                                           ,

where is the number of moles, is the amount of substance and is the Avogadro's constant.

Therefore,

                                           .

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